Top Principal Software Engineer Jobs in Denver & Boulder, CO

Leads embedded software development for satellite, airborne, and ground systems. Responsibilities include software requirements, architecture, design, coding, testing, integration, documentation, support, and test infrastructure development. The role requires expertise in embedded Linux and languages such as C/C++, Rust, and Python, along with system interfaces, formal development practices, and software deployment. It is fully on-site and may support classified defense programs requiring eligibility for TS/SCI clearance.

Leads the architecture and development of advanced mission modeling and simulation software. Defines end-to-end simulation architectures spanning physical phenomenology, signal propagation, sensors, onboard processing, telemetry, commanding, and mission data products. Translates mission requirements and physical behavior into models, software components, interfaces, and data flows; guides technical trades, development, integration, verification, and validation. Collaborates across physics, payload, mission systems, and software teams while supporting design reviews and technical presentations.

Develops embedded satellite software and test infrastructure for command and control, mission planning, and data analysis. Performs the full software lifecycle, including requirements, architecture, design, coding, testing, integration, documentation, and support. The role requires experience with software development, cloud and web technologies, object-oriented design, UML modeling, configuration management, and formal development practices. Work is primarily on-site and requires an active TS/SCI clearance.

Leads the architecture and development of integrated mission modeling and simulation software. Defines end-to-end simulation architecture spanning physical phenomenology, signal propagation, sensors, onboard processing, telemetry, commanding, and mission data products. Translates mission requirements and physical behaviors into models, software components, interfaces, and data flows; conducts architecture trades; directs developers; and supports integration, verification, validation, testing, and major program reviews.

Leads embedded software development for satellite, airborne, and ground systems. Responsibilities include software requirements, architecture, design, coding, testing, integration, documentation, lifecycle support, and test infrastructure development. The role involves embedded Linux, C/C++, Rust, Python, CI/CD, FPGA interfaces, messaging systems, and formal software development practices. It also requires collaboration across engineering organizations and may involve technical leadership, simulation, DevSecOps, and hardware-in-the-loop testing.

Develop and maintain embedded satellite software and test infrastructure for command and control, mission planning, and data analysis. Perform full software lifecycle activities, including requirements, architecture, design, coding, testing, integration, documentation, and support. The role requires expertise in modern software technologies, formal development practices, UML modeling, cloud and web development, and an active TS/SCI clearance. Work is fully on-site with potential travel between company and other facilities.

Develop and maintain embedded satellite software and test infrastructure for command and control, mission planning, and data analysis. Perform full software lifecycle activities, including requirements, architecture, design, coding, testing, integration, documentation, and support. Work with cloud, web, database, modeling, simulation, and DevSecOps technologies while collaborating across teams in an on-site environment.

Leads hands-on modernization of Pearson’s content platform, including large-scale migrations, shared platform services, APIs, AI capabilities, cloud infrastructure, security, reliability, and technical roadmaps. Designs and delivers complex systems, writes production code, resolves high-impact incidents, evaluates technologies, and establishes engineering standards. Mentors senior engineers, influences cross-functional stakeholders, and drives initiatives from exploration through launch while balancing scalability, cost, maintainability, and risk.

Lead the architecture and technical direction of Forward Financing’s core fintech platform. Design scalable distributed backend systems, guide cross-team initiatives, establish engineering best practices, resolve incidents, and mentor engineers. The role owns the technical roadmap and architectural vision while partnering across teams to improve reliability, observability, code quality, and delivery. Ruby on Rails expertise is required, along with strong communication, influence, agile development experience, and a broad backend or full-stack perspective.

Lead the rearchitecture and development of a cloud-native Banking as a Service platform. Design scalable APIs, microservices, event-driven systems, and partner integrations using modern cloud, DevOps, observability, and security practices. Drive architectural strategy, technical debt reduction, incident response, code quality, compliance, and continuous delivery. Mentor engineers, collaborate with product and architecture teams, evaluate emerging technologies, and own capabilities through project delivery.

Principal Software Engineer responsible for hands-on development, architectural evolution, modernization, and resolution of complex technical problems across a mature education technology product. The role provides cross-team technical leadership, guides architecture and integrations, mentors senior engineers, and applies pragmatic AI-assisted development. Success involves improving system maintainability, enabling product evolution, surfacing technical risks, and strengthening organizational engineering capabilities.

Lead architecture and roadmap for Azure PostgreSQL systems; design and review scalable, maintainable database engine features (query processing, storage, transaction logging, recovery, versioning, IO, scale-out). Influence coding standards and run code reviews, write proof-of-concept or production code, contribute to open-source PostgreSQL/Linux, and participate in rotational on-call operations.

Architects scalable distributed systems and low-level cloud platform services, establishes engineering standards and SLOs, designs CI/CD and deployment safety pipelines, leads complex incident escalations and postmortems, and mentors engineering teams. The role requires full-stack, API, and microservices development in Linux or Unix environments, strong SRE expertise, architectural leadership, and US citizenship with eligibility for security clearance.

Provides technical leadership for advanced aerospace software systems, including architecture, requirements, code reviews, documentation, performance optimization, and reliability improvements. Leads major projects, mentors engineering teams, collaborates across disciplines, and represents software engineering in strategic decisions. The role requires expert programming ability, extensive software development leadership, and experience with aerospace or defense systems, embedded software, real-time operating systems, and modern development technologies.

Lead technical direction for CloudBees CI while remaining hands-on with Java development, distributed systems, Kubernetes, Jenkins internals, architecture, refactoring, performance, and reliability. Drive cross-team initiatives, design and code reviews, mentoring, testing, secure coding, release quality, incident resolution, and customer-focused improvements to an established CI/CD platform.

Leads software architecture and engineering delivery for complex classified government systems. Responsibilities include designing cloud-native and distributed architectures, guiding teams of 30+ developers, establishing APIs and interface standards, driving DevOps and CI/CD adoption, governing software quality and resilience, communicating technical risks, facilitating customer architecture reviews, and mentoring distributed engineering teams.

Leads architecture, hands-on software development, deployment, and production issue resolution for strategic customer projects. Drives AI innovation, platform resiliency, security, observability, performance, and operational improvements. Partners with executives, engineering, product, and customer success teams to prioritize strategic programs, improve customer value, share technical best practices, and remove production blockers.

Provides technical leadership for Azure cloud-scale distributed data platforms processing network telemetry and operational data. Defines architecture and long-term technical strategy, leads streaming and batch system design, resolves complex scalability and reliability challenges, oversees production readiness and continuous improvement, and influences cross-team technical investments. Partners across Azure Networking, conducts design reviews, establishes reusable engineering patterns, improves observability and quality, and mentors engineers and technical leaders.

Principal frontend-focused software engineer responsible for leading frontend architecture, standards, tooling, accessibility, performance, testing, and deployment practices. The role delivers scalable customer-facing web applications, component libraries, and design systems using React or Angular. It includes cross-functional product collaboration, technical decision-making, mentoring, modernization initiatives, and occasional full-stack work. The position is remote, requires U.S. citizenship, Public Trust 6C eligibility, and approximately 0–10% business travel.

Principal Software Developer responsible for designing, developing, and scaling distributed, high-throughput software systems. The role delivers features, improves reliability, identifies bottlenecks, leads system migrations from monoliths to microservices, and works across the technology stack. Responsibilities include architectural design, cloud engineering, technical leadership, mentoring developers, communicating technical decisions, and using AI and automation tools to improve engineering outcomes.

Lead architecture, development, scaling, and reliability for SingleStore Helios, a multi-cloud SaaS platform. Design Kubernetes operators, controllers, networking, routing, and distributed control planes across AWS, Azure, and GCP. Build resilient Go and Python systems, support AI and vector workloads, resolve complex Tier-3 production incidents, and maintain compliance controls. Mentor engineers, author architecture documents, and influence cross-functional technical strategy.

Own the technical vision and architecture for ServiceTitan’s iOS and Android mobile platform. Design scalable, reliable, secure, and high-performing systems; modernize monolithic codebases; improve observability, developer productivity, CI/CD, testing, and release processes. Mentor engineers, influence mobile strategy, define success metrics, support recruiting, and collaborate with cross-functional stakeholders. The role is approximately 60% development and requires expertise in native mobile development, performance engineering, modular architectures, and cloud-supported mobile backends.

Provides technical leadership on complex, high-impact engineering projects from design through launch. The role involves architecture, company-wide initiatives, engineering excellence, mentoring technical leaders, and establishing standards for scalable, reliable, secure, observable systems. The engineer will collaborate across teams, communicate complex technical topics, and apply customer-focused decision-making and A/B testing techniques.

Leads hands-on development of production software while owning application and service architecture. Diagnoses systemic issues across components, coordinates integration efforts, and improves reliability, performance, and incident response. Builds scalable full-stack SaaS applications using Java, Spring Boot, TypeScript, Node.js, and React. Applies AI-assisted development tools, mentors engineers through influence, and makes technical decisions that balance maintainability, business needs, and client impact.

Principal Software Engineer leading architecture, development, and technical strategy for complex software platforms. The role requires designing scalable and secure systems, guiding engineering standards, mentoring engineers, resolving complex technical issues, and partnering with product, laboratory, and bioinformatics teams. Responsibilities include software architecture, React and .NET development, database optimization, REST APIs, distributed systems, DevOps, regulatory compliance, and long-term technology roadmaps supporting clinical and genomic workflows.